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Theorem pnfnre 8360
Description: Plus infinity is not a real number. (Contributed by NM, 13-Oct-2005.)
Assertion
Ref Expression
pnfnre  |- +oo  e/  RR

Proof of Theorem pnfnre
StepHypRef Expression
1 cnex 8296 . . . . . 6  |-  CC  e.  _V
21uniex 4581 . . . . 5  |-  U. CC  e.  _V
3 pwuninel2 6546 . . . . 5  |-  ( U. CC  e.  _V  ->  -.  ~P U. CC  e.  CC )
42, 3ax-mp 5 . . . 4  |-  -.  ~P U. CC  e.  CC
5 df-pnf 8355 . . . . 5  |- +oo  =  ~P U. CC
65eleq1i 2304 . . . 4  |-  ( +oo  e.  CC  <->  ~P U. CC  e.  CC )
74, 6mtbir 682 . . 3  |-  -. +oo  e.  CC
8 recn 8305 . . 3  |-  ( +oo  e.  RR  -> +oo  e.  CC )
97, 8mto 672 . 2  |-  -. +oo  e.  RR
109nelir 2518 1  |- +oo  e/  RR
Colors of variables: wff set class
Syntax hints:   -. wn 3    e. wcel 2209    e/ wnel 2515   _Vcvv 2821   ~Pcpw 3688   U.cuni 3933   CCcc 8170   RRcr 8171   +oocpnf 8350
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 623  ax-in2 624  ax-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-14 2212  ax-ext 2220  ax-sep 4247  ax-un 4576  ax-cnex 8263  ax-resscn 8264
This theorem depends on definitions:  df-bi 117  df-tru 1405  df-fal 1408  df-nf 1514  df-sb 1816  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-nel 2516  df-rex 2534  df-rab 2537  df-v 2823  df-in 3226  df-ss 3233  df-pw 3690  df-uni 3934  df-pnf 8355
This theorem is referenced by:  renepnf  8366  nn0nepnf  9620  xrltnr  10163  pnfnlt  10171  xnn0lenn0nn0  10249  inftonninf  10860  pcgcd1  13088  pc2dvds  13090
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